/ray/src/lib/crypto/twofishcipher.h

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/*
 * lib/crypto/twofishcipher.h
 * 
 * Header file containing class TwoFishCipher, a class for 
 * encrypting/decrypting data using the twofish algorithm 
 * (Bruce Schneier et al). 
 * 
 * Copyright (c) 2001--2004 by Wolfgang Wieser ] wwieser (a) gmx <*> de [ 
 * 
 * This file may be distributed and/or modified under the terms of the 
 * GNU General Public License version 2 as published by the Free Software 
 * Foundation. (See COPYING.GPL for details.)
 * 
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 * 
 */

#ifndef _LIB_CRYPTO_TwoFishCipher_H_
#define _LIB_CRYPTO_TwoFishCipher_H_ 1

#include <lib/crypto/bcipherbase.h>


class TwoFishCipher : public BlockCipherBase
{
    public:
        static const BlockCipherBase::Parameters par;
        
    private:

        uint32 c_w[8];       //   32 bytes
        uint32 c_k[32];      //  128 bytes
        uint32 c_s[4][256];  // 4096 bytes
        
        void _reset();
        
        TwoFishCipher(const TwoFishCipher &);
        void operator=(const TwoFishCipher &);
    public:
        TwoFishCipher() : BlockCipherBase()  {}
        ~TwoFishCipher()  {  _reset();  }
        
        const Parameters *GetPar() const
            {  return(&TwoFishCipher::par);  }
        
        int SetKey(char *userkey,size_t len);
        
        int CheckWeakKey();
        

        void EncryptBlock(char *ibuf,char *obuf);
        void DecryptBlock(char *ibuf,char *obuf);
        
        int CopyFrom(BlockCipherBase *from);
};

#endif   /* _LIB_CRYPTO_TwoFishCipher_H_ */

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